Purge ejector assembly for an engine

Abstract

A purge ejector assembly for an engine has a first fluid passage with a nozzle device therein that raises flow velocity of air and a first valve therein between an engine manifold port and the nozzle and permitting flow from the engine manifold port toward the nozzle device while restricting reverse flow. A second fluid passage has a second valve therein between the engine manifold port and a purge flow port, and permitting flow from the purge flow port toward the engine manifold port while restricting reverse flow. A third fluid passage extends from a second passage position located between the purge flow port and the second valve to a first passage position located between the nozzle device and an air inlet channel port. A third valve in the third passage permits flow from the purge flow port toward the air inlet channel port, while restricting reverse flow.

The invention claimed is: 
     
       1. A purge ejector assembly for an engine, comprising:
 a first fluid passage defining a fluid connection between an engine manifold port and air inlet channel port; 
 a nozzle device disposed in said first fluid passage and configured to raise the flow velocity of the air flowing in said first fluid passage; 
 a first valve disposed in said first fluid passage at a position in-between said engine manifold port and said nozzle device, said first valve being configured to permit fluid to flow through said first valve from said engine manifold port toward said nozzle device, while restricting fluid to flow through said first valve from said nozzle device toward said engine manifold port; 
 a second fluid passage defining a fluid connection between a purge flow port connectable to a canister purge passage and said engine manifold port; 
 a second valve disposed in said second fluid passage at a position in-between said engine manifold port and said purge flow port, said second valve being configured to permit fluid to flow through said second valve from said purge flow port toward said engine manifold port, while restricting fluid to flow through said second valve from said engine manifold port toward said purge flow port, thereby enabling evaporated fuel to flow in said second fluid passage from said canister purge passage to said engine manifold port when said assembly is subjected to a negative pressure via said engine manifold port; 
 a third fluid passage defining a fluid connection between said purge flow port and said air inlet channel port, and extending from a second fluid passage position located between said purge flow port and said second valve to a first fluid passage position located between said nozzle device and said air inlet channel port; 
 a third valve disposed in said third fluid passage and configured to permit fluid to flow through said third valve from said purge flow port toward said air inlet channel port, while restricting fluid to flow through said third valve from said air inlet channel port toward said purge flow port, thereby enabling evaporated fuel to flow in said third fluid passage from said canister purge passage to said air inlet channel port when said assembly is subjected to a positive pressure via said engine manifold port forming a negative pressure in said third fluid passage, 
 wherein the purge ejector assembly is an assembled single unit. 
 
     
     
       2. Purge ejector assembly according to  claim 1 , wherein the nozzle device has a tip end extending toward the air inlet channel port to define a choke passage relative to the air flowing through the nozzle device. 
     
     
       3. Purge ejector assembly according to  claim 1 , wherein each one of the second valve and the third valve comprises a corresponding housing and a corresponding displaceable member swingable connected to said corresponding housing forming a swingable connection permitting said displaceable member to set the valve into an open position and a closed position, wherein said swingable connection of said second valve and said swingable connection of said third valve are opposite arranged along a line being perpendicular to the length direction, and a first length distance, as defined by the distance between the swingable connection of said second valve and the line, being substantially equal to a second length distance, as defined by the distance between the swingable connection of the third valve and the line. 
     
     
       4. Purge ejector assembly according to  claim 3 , wherein said swingable connection of said second valve and said swingable connection of said third valve are symmetrical arranged along the line being perpendicular to the length direction. 
     
     
       5. Purge ejector assembly according to  claim 1 , wherein the assembled single unit is formed by a first part, a second part and a third part being interconnected to each other via the first valve, the second valve and the third valve. 
     
     
       6. Purge ejector assembly according to  claim 5 , wherein
 the first part is interconnected to the second part via the third valve 
 the first part is also interconnected to the third part via the second valve, 
 the second part is interconnected to the first part via the third valve, 
 the second part is interconnected to the third part via the first valve, 
 the third part is interconnected to the first part via the second valve, and 
 the third part is interconnected to the second part via the first valve. 
 
     
     
       7. Purge ejector assembly according to  claim 1 , wherein any one or any two or each of the first, second and third valves is a check valve. 
     
     
       8. Purge ejector assembly according to  claim 1 , wherein any one or any two or each of the first, second and third valves is configured to work automatically. 
     
     
       9. Purge ejector assembly according to  claim 1 , wherein the first valve, and in particular each of the first, second and third valves, is a non-controllable valve that can only close the flow path in one flow direction through the valve. 
     
     
       10. An evaporation fuel purge system comprising a fuel tank for storing fuel, a canister for absorbing evaporation fuel emitted from the fuel tank and adapted to desorb the evaporation fuel, said canister being connected to said fuel tank via an evaporative vent passage, a canister purge passage extending from said canister to an engine manifold and a purge valve disposed in said purge passage and configured to regulate the flow of evaporated fuel in said purge passage,
 wherein said system further comprises a purge ejector assembly according to  claim 1 , said purge ejector assembly being disposed at a position in said purge passage between said purge valve and said engine manifold. 
 
     
     
       11. An evaporation fuel purge system comprising a fuel tank for storing fuel, a canister for absorbing evaporation fuel emitted from the fuel tank and adapted to desorb the evaporation fuel, said canister being connected to said fuel tank via an evaporative vent passage, a canister purge passage extending from said canister to an engine manifold and a purge valve disposed in said purge passage and configured to regulate the flow of evaporated fuel in said purge passage,
 wherein said system further comprises a purge ejector assembly according to  claim 1 , said purge ejector assembly being located between an air inlet passage and an air outlet passage in the flowing direction of the intake air. 
 
     
     
       12. An engine arrangement comprising an engine, an air inlet channel, an air intake unit, and a purge ejector assembly according to  claim 1 ,
 wherein the purge ejector assembly is mounted directly to a wall of the air inlet channel or directly to a wall of the air intake unit, or 
 wherein the purge ejector assembly or a housing thereof is partly or completely integrally formed with the air inlet channel or air intake unit. 
 
     
     
       13. A vehicle comprising an evaporation fuel purge system according to  claim 10 . 
     
     
       14. A vehicle comprising an evaporation fuel purge system according to  11 . 
     
     
       15. A vehicle comprising an engine arrangement according to  claim 12 .